Comments

What steps will reproduce the problem?
I don't have an ad hoc example but I stumbled upon the issue while go getting a githhub
repo so the code is there.
1.
$ go get github.com/jteeuwen/glfw
What is the expected output?
$
What do you see instead?
# github.com/jteeuwen/glfw
ld: duplicate symbol _setCharCB in $WORK/github.com/jteeuwen/glfw/_obj/glfw.cgo2.o and
$WORK/github.com/jteeuwen/glfw/_obj/_cgo_export.o for architecture x86_64
collect2: ld returned 1 exit status
Which compiler are you using (5g, 6g, 8g, gccgo)?
6g
Which operating system are you using?
$ uname -rs
Darwin 11.3.0
Which revision are you using? (hg identify)
$ hg identify
96bd78e7d35e weekly/weekly.2012-02-22
$ go version
go version weekly.2012-02-22 +96bd78e7d35e
Please provide any additional information below.
more details here:
https://groups.google.com/d/msg/golang-nuts/_HKIFbWX0Co/dwASE-SGPXIJ

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'setCharCB' is defined in line 25 of
https://github.com/jteeuwen/glfw/blob/master/callback.go as:
// void setCharCB() { glfwSetCharCallback(goCharCB); }
and only called from line 195 in the same file as:
C.setCharCB()
Where the linker gets the underscored version from is unknown to me.

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Thanks for tracking that down. That kind of definition
is no longer supported in cgo packages that use //export.
You should talk to the owner of that code to get it updated.
The change is documented in "The cgo command" section
here: http://weekly.golang.org/doc/go1.html#cmd_cgo
Russ